Intermediate-magnitude postseismic slip follows intermediate-magnitude (M 4 to 5) earthquakes in California

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.1029/2018GL081001. This is version 2 of this Preprint.

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Authors

Mohamed A. Alwahedi, Jessica Cleary Hawthorne

Abstract

The magnitude of postseismic slip is useful for constraining physical models of fault slip. Here we examine the postseismic slip following intermediate-magnitude (M 4 to 5) earthquakes by systematically analyzing data from borehole strainmeters in central and northern California. We assess the noise in the data and identify 36 records from 12 earthquakes that can be interpreted. We estimate postseismic to coseismic moment ratios by comparing the coseismic strain changes with strain changes induced by afterslip in the following 1.5 days. The median estimated postseismic moment is 0.36 times the coseismic moment, with a 90% confidence interval between 0.22 and 0.54. This postseismic moment is slightly larger than typically observed following large (M > 6) earthquakes but smaller than observed following small (M 2 to 4) earthquakes. The intermediate-magnitude postseismic slip suggests a size dependence in the dynamics of earthquakes or in the properties of fault areas that surround earthquakes.

DOI

https://doi.org/10.31223/osf.io/fkvmz

Subjects

Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics

Keywords

Dates

Published: 2018-10-29 15:53

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License

Academic Free License (AFL) 3.0